無法捕獲的線程異常
public class ExceptionThread implements Runnable {
@Override
public void run() {
throw new RuntimeException();
}
public static void main(String[] args) {
try {
ExecutorService service = Executors.newCachedThreadPool();//new Handler()
service.execute(new ExceptionThread());
} catch (Exception e) {
// TODO: handle exception
System.out.println("無法捕獲，執行不到。。。。");
}
}
}
--控制檯輸出
Exception in thread "pool-1-thread-1" java.lang.RuntimeException
at com.smallfan.thread.ExceptionThread.run(ExceptionThread.java:10)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
修改後代碼
public class ExceptionThread2 implements Runnable{
@Override
public void run() {
Thread thread = Thread.currentThread();
System.out.println("run.."+thread);
System.out.println("ex.."+thread.getUncaughtExceptionHandler());
throw new RuntimeException();
}
}
//通過uncaughtException來捕獲異常
class Mycatch implements Thread.UncaughtExceptionHandler{@Override
public void uncaughtException(Thread t, Throwable e) {
System.out.println("e..."+e);
}
}
class Handler implements ThreadFactory{
@Override
public Thread newThread(Runnable r) {
System.out.println(this+" this new thread ");
Thread t= new Thread(r);
t.setUncaughtExceptionHandler(new Mycatch());
System.out.println("e..."+t.getUncaughtExceptionHandler());
return t;
}
}
public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool(new Handler());//
service.execute(new ExceptionThread2());
}
--修改後控制檯輸出
com.smallfan.thread.Handler@4e25154f this new thread
e...com.smallfan.thread.Mycatch@70dea4e
run..Thread[Thread-0,5,main]
ex..com.smallfan.thread.Mycatch@70dea4e
com.smallfan.thread.Handler@4e25154f this new thread
e...com.smallfan.thread.Mycatch@21a20aa6
e...java.lang.RuntimeException
Thread.UncaughtExceptionHandler是java se5中的新接口，他提供在每個Thread對象都附着一個異常處理器
如：uncaughtException(Thread t, Throwable e)。會在線程因未捕獲的異常臨近死亡時被調用。